[Q] Event handling tool, module and image

[Naoki-Hada]

Hi all,

I'm still new to Lua and not sure if we can implement in SDK,

but I'd like to handle following events.

1) Current module changes

    There is LrApplicationView.getCurrentModuleName().

2) Current tool changes in Develop mode

    There is LrDevelopController.getSelectedTool().

3) Selected image changes

     There is LrCatalog.getTargetPhoto() and LrCatalog.getTargetPhotos()

1)-3) seems at least readable, so I think we can implement as timered polling.

But can it be event driven like addEventListner function in JavaScript?

Thank you,

Naoki

[johnrellis · Accepted solution]

Polling can work pretty well if carefully implemented. 

You might also consider:

LrAnalytics.observeModuleChange() -- undocumented, I've never seen reports of someone trying it

LrApplication.addActivePhotoChangeObserver() -- undocumented, Re: Observe when a photo has been selected within the library module?

LrDevelopController.addAdjustmentChangeObserver()

[Naoki-Hada]

johnrellis​

Thank you very much for the pointers.

It is very helpful.

-Naoki